What makes Koh Samui's beaches stand out?
Koh Samui sits in Surat Thani, Thailand and is home to 10 ranked beaches on OnlyBeaches. Every beach here is scored by the OnlyBeaches Index — a 1-10 metric blending water purity, live conditions (waves, water temperature, wind), crowd intelligence and vibe.
Whether you're after the highest-scoring beach in Koh Samui or a quieter hidden cove, the list above is refreshed every 30 minutes using live Stormglass and OpenWeather data.